Great at helping structure basic approach

I took the 9-week MPrep in-person course and found it helpful at establishing a basic structure around my preparation. The online videos, HW assignments, and in-person lectures are great to get you acquainted with the types of problems tested in the GMAT. However, its worth noting that the course alone is not sufficient in getting you a very high score. From my personal experience, my score only jumped 30 points at the end of the course (650 to 680), but studying for ~7 weeks on my own post-course helped get me in the 730+ range and eventually end up with 760 on the actual test.

I'd recommend the MPrep course (esp the Verbal material), but would caution that you'll still need to prep on your own for 1-2 months (daily) if you're shooting for a very high score. The website material is great and the answer explanations are decent -- they'll continue to come in handy after the end of the course.

I would definitely recommend my instructor Chris Gentry without any reservations.